Big_kid, thank you!
Edn35 -Thank you so much! I put down the tarp that came with the pool. Then I put down a 30'x60' tarp, the insulation, then folded the tarp back over the insulation. I did not use sand. I live in NE Florida and all we HAVE is sand! Nearly impossible to pack down. Packs fine if it's wet. But let it dry and it just loosens up on you. I also resessed stepping stones for under the feet. It is difficult to get a bead on the stones tho, once the weight of the pool and water set in. I'm going to trim the insulation back some more once the rain lets up. That should make it easier to make sure the feet are over the stones.